void main() {
  String cat = "小喵咪";
  print(cat);

  String dog = "小狗";
  //模版字符串
  print('$dog"和"$cat是好朋友');
  print('当前字符串的长度:${dog.length}');

  //换行 \n
  String countS = '$dog\n和\n$cat\n是好朋友';
  print(countS);

  //换行 “”“
  String maxcountS = """
小猫
和
小兔
是好朋友
""";

  print(maxcountS);
}
